Underreamer.



6. L. MUNSINGER.

UNDERREAMER.

APPLICATION FILED use. 23, 1914.

Patented Jan. 4, 1916.

2 SHEETS-SHEET UNITED srnrns m m orsion.

oHAiaLEs I... ivioivsiivenn', or LIMA, OHIO.

UNDERREAMER;

To all whom it, mag concern: I

Be it known that 1, CHARLES L. MUN- SINGER, a citizen of the United States, residing at Lima, in the county of Allen and.

. into the bore or withdrawing the samethere from, the tool being of such structural formation as to admit of the cutters automatically expanding when clearing the lower end of the casing and contracting when drawing the tool into the casing preliminary i and which admits of any one ofthe 'partsj being readily replaced at a nominal cost,

to removing the same from thewell.

A further purpose of the invention isthe provision of an under reamer for deep wells which embodies a minimum number of parts such tool being effective and positive in operation for the purpose designed.

lV-ith the foregolngpbjects in view and such others as result'from the peculiar structure and which may suggest themselves as the nature of the structure is understood the invention maybe said to consist of the novel features, details of construction and combinations of parts which hereinafter will be more particularly set forth, illustrated in the drawings hereto attached and finally claimed. I i

Referring to the drawings, Figure 1 is a view in elevation of an under reamer embodying the invention a portion ofthe stock.

being in section; Fig. 2 is an enlarged view of the lower portion of the tool; Fig.v 3 isan enlarged section of the parts shown in Fig. 2 illustrating the relation'of the elements when the reamer Fig. 4: is a view of the parts illustrated in Fig. 3 showing the relation of the elements .when the cutters and easing riders have Fig. 5 1s a horizontal cleared the casing; I section of the tool on the line 55 of Fig. 3; Fig. 6 is a detail perspective of the tool with the several parts separated and disposed in a group; Fig. 'Tis a detail perspective view is located in the casing;

Application filed Decemberv 23, 19l4 Serial No. 878,768.

of the cross bar towhich the casing riders .are pivotally attached; Fig. 8 is I a detail perspectlve view of one of the casing riders.

Corresponding and like parts are referred to in the following description and indicated in all the views of the drawings by the same reference characters.

The tool comprises a stockl to Which the working parts are attached. This stock may Specification of Letters Patent. 5 Patented Ja n. 4 1916 be of any length and diameter depending upon the particular work for which the tool 7 is designed. A bore or opening 2 is formed in the stock and extends axially therethrough. The boreis enlarged at its upper endand internally threaded, as indicated at 3, to admit of the-tool being coupled to the ordinary rods t or like means generally employedfo'r operating drills and like toolsin deep wells. The lower end of the bore 2 is contracted, as indicatedat t. A shoulder 5 is formed at the inner end of the contracted p'ortion of the bore. Tropenings are formed in opposite sides of the stock at the lowerend thereof, each of such openings :comprising al'ongitudinal opening 6 and atransverse' opening .7 These T-openings are adapted to receive the upper ends fully hereinafter. I

I Similar or like cutters 8 are opposite sides of the stock and are pivotally connectedat their upper ends thereto so as to swing laterally at their lower ends. Each of the cutters 8 is formed at itsfupper-end with a T-head, the-same comprising a centrallyt disposed member 9 and a transverse memberlO. The parts 9 and 10-are adapted to obtain a relatively snug fit within the T- opening formed in the stock 1 it being understood that the transverse member 10 and the transverse opening 7 are of such relative proportions asto admitofthe cutter havl-ng located upon of the cutters, .as will be explained more a limited lateral movement at its lower end;

When the cutters are in place they are retained in position by means of pins 11 which pass through transverse openings formed in colncidentrelatlon in the member 9 andthe parts of the stock 1 at the sides of themem: her 9. Each ofthe cutters 8 is formed upon its inner face with a longitudinal channel 12,

which forms a guide for the lower end of the expander to ride in, thereby holding the exander and cutters in a I given position. Each of the cutters is also formed with a longitudinal slot 13 and this slot at itsupper end merges .into a recess extending alongthe outer side of the cutter, such recess tapering toward its upper end and vanishing into the outer side of the cutter. The inner wall of this recess is formed with inclined faces 14; and 15, the latter being inclined more rapidly than the face 16: and disposed adjacent the slot 13. The recesses are indicated at 16 and are designed to receive the upper portion of the casing riders when the cutters are expanded.

The expander 17 consists of a bar which is arranged between the cutters 8 and at the lower end of the stock 1. The expanding head formed at the lower end of the body of the expander has oppositely inclined faces 18 which are adapted to ride upon the inner faces of the cutters 8 and force the lower ends of such cutters apart, as indicated most clearly in Fig. l. A rod 19 is attached at its lower end to the upper end of the expander 17 being preferably threaded there to and this rod passes through the contracted portion 4 of the bore 2 and extends upwardly into such bore and is threaded at its upper end to receive a nut 20. A stout expansible helical spring 21 is mounted upon the upper portion of the rod 19 and is confined between the shoulder 5 and the nut 20 and normally exerts an upward pressure upon the expander to force the expanding head thereof between the lower ends of the cutters 8. \Vhen the expander 17 is moved downwardly to carry the expanding head beyond the lower ends of the cutters 8, the latter are free to move inward, thereby admitting of the tool passing through the casing either into the well or from the well. When the expander is moved to cause its expanding head to clear the lower ends of the cutters the upper ends of the casing riders are pressed inward as indicated most clearly in Fig. 3 but 'when the expander is moved upward to b ing its expanding head between the cutters the upper ends of the casing riders are thrown outward, as indicated most clearly in Fig. 4.. The expander is formed with a transverse slot 22 to receive the cross bar 23 to which the casing riders are attached.

The cross bar 23 is fitted in the opening 22 of the expander and its opposite end portions project equally from opposite sides of the expander and enter the slots 13 of the cutters 8. A pin 24 secures the cross bar 23 within the opening of the expander. The outer ends of the expander are cut away upon one side, as indicated most clearly in Figs. 5 and 7 and the shoulders formed at the inner ends of the reduced portions comprise vertical faces 25 and inclined faces 26. The cross bar 23 is movable with the expander and its end portions are adapted to travel in the slots 13 of the cutters S.

The casing riders 27 have their lower ends cut away upon one side, the reduced ends overlapping the reduced ends of the cross bar 23 and being connected thereto by means of pivot fastenings 28 which pass through registering openings formed in the oven lapping reduced end portions of the parts 23 and 27. The upper ends of the casing riders are made rounding or beveled, as indicated at 29 so as to ride upon the lower end of the casing when pulling upi-vard upon the tool and thereby cause the casing riders to come together and pass within the casing. The lower ends of the casing riders are inwardly inclined, as indicate l at 30, thereby enabling the upper ends of the casing riders to be pressed together without causing the lower ends of the casing riders to project to an objectionable distance and thereby pre- Vent the casing riders from passing within the casing. As shown most clearly in Fig. l the inner lower ends of the casing riders engage the inclined faces 26 of the shoulders formed at the inner ends of the reduced portions of the cross bar 23, thereby limiting the outward movement of the casing riders at their upper ends.

When the parts comprising the tool are assembled they occupy the position shown most clearly in Figs. 3 and l t hen the tool occupies a position within the casing the upper ends of the casing riders 27 are pressed together and the expander is moved downward to bring its expanding head be yond the lower ends of the cutters 8. lVhen the tool is in position in the well with the casing riders below the casing the spring 21 is expanded and the lower ends of the cutters 8 arepressed outward by the expanding head coining between then. The casing is indi *ated at 31' in Figs. 3 and When it is desired to place the tool within the casing preliminary to moving it to a position within the well below the casing it is necessary to force the expander downward so as to with draw the expanding head from between the cutters, thereby admitting of the lower ends of such cutters coming together wl ereby the tool is enabled to be introduced into the casing. The expander may be held projected l j passing a binder around the upper ends of the casing riders and for convenience such rider may consist of a ring which may be slippedupon the stock and cutters. As the tool is pressed downward into the casing the binder will become disengaged from the tool by engaging the upper end of the casing and may be removed. The rod 4 or other means for operating the tool may be coupled thereto and this rod may comprise sections which are added in the well known manner as the tool is lowered. When the casing riders clear the lower end of the casing 31 the spring 21 expands and moves the expander l7 upward thereby forcing the head of the expander between the lower ends of the cutters 8 which are thereby thrown out- .ward. -As the expander moves upward the upper ends of the casing riders are thrown outward by riding upon theinclined faces and-14: forming theinner iwallsof the recesses 16. Whenit is required to remove the tool the same is drawn upward'into the V casing riders engage the lower end oft-he casing .31 theexpander .is .momentarily retarded in its upward-movement and as the stock 1, with the, cutters attached thereto,

continues to move upward the expander-is relatively moved downward thereby'brmge ing its expander head to a'position beyond the lower ends of thecutt'ers. As the cutters 8 move upward the upper ends of the casing rider's Q'T'gradually move inward by riding upon the inclined faces 14 and when the upper ends of the casing riders reach the abrupt or more rapidly inclined faces 15 they move inward more quickly and this occurs simultaneously with theprojecting of the expanding head beyond the lower ends of the cutters and at this time the rounded or beveled ends 29 of the casing riders clear the lower' end of the casing and enter the same,

as indicated most clearly in Fig. 3, thereby admitting of the tool passing through/the casing upon a continued upward pull thereon. V o

It is to be understood that the drawings illustrate a preferred embodiment of the invention but within the scope of the invention as claimed various changes inthe form, proportion and minor details of construction may be resorted to when adapting the invention to meet certain conditions and requirements without departing from the nature of the invention as claimed. v

Having thus described the invention, what is claimed as new is 1. A tool of the character set forth comprising a stock, laterally movable cutters connected with the stock and formed with longitudinal slots, an expander arranged between the cutters, a cross bar 'movable with the expander and having its end portions entering the slots of the cutters and riders pivotally connected to the projecting ends of the cross bar.

2. In a tool of the character specified, the combination of a stock, cutters connected with the stock .and adapted to be spread by a lateral movement, each of the cutters being formed with a longitudinal slot, a longitudinal movable expander arranged between the cutters, and riders having pivotal connection with the said expander and arranged to operate in the slots of the cutters and having a limited longitudinal and lateral pivotal movement.

' 3. A tool of the character specified comprising a stock, cutters connected with the stock and adapted to move laterally, each .ofthe cutters being formedwith :a longitudinal slot, ,a longitudinally movable expander arranged between the cutters,riders having their lower ends inclined inwardly and pivotally connected with the expander and adapted to operate in the longitudinal slots of the cutters.

.4. In a tool of the character specified, the

.combination of .a stock, cutters havingconnectlon with the stockland'movable laterally, each of such cutters being formed wlth a longitudinalslot and a recess in its outer side in communication with the slot, the inher wall of such recess being lncllned and vanishing at itsupper end into the outer side of the cutter, a longitudmally movable expander arranged between the cutters, and

riders having their lower ends pivotally connected with the expander and adapted toioperate in the longitudinal slots of the cutters and having their upper ends adapt ed to operate in the recesses of the cutters and to travel uponthe inclined walls of .such recesses.

5. In a tool of the character specified, the combination of a stock, cutters connected with the stock and movable laterally, each I of such cutters being formed with a longi-' tudinal slot and a' longitudinally extending recess in its outer face in line with the slot,

the inner wall of such recess being inclined throughout its length, the lower portion being more rapidly inclined than the upper portion and the latter vanishing into the outer side of the cutter, a longitudinally movable expander arranged between the cutters, and riders having pivotal connect1on with the expander at their lower'ends and adapted to operate in the longitudinal slots .and recesses of the cutters, said riders having their upper ends beveled;

6. A tool of the character specified com-- prising a stock, cutters connected with the stock and movable laterally, each of such cutters having a longitudinal slot, a longitudinally movable expander arranged between the cutters, a cross bar mounted upon the expander and. having its end portions cut away and the shoulders formed at the inner ends of the cut away portions inclined, and riders having their lower ends reduced and pivotally connected to the reduced ends of the cross bar. and having their lower ends inwardly inclined and their upper ends beveled.

7. In a tool of the character specified, the combination of a stock, cutters having pivotal connection with the stock and formed upon their inner faces with longitudinal guides and having longitudinal slots and longitudinal recesses in their outer sides in v line with the longitudinal slots, said recesses having their inner walls inclined, a longi-f tudinally movable expander arranged be-' tween the cutters and adapted to engage the guides upon the inner faces of the cutters and riders having pivotal connection with the expander and movable longitudinally in the slots and recesses of the cutters and having their upper ends beveled.

8. In a tool of the character specified, the combination of a stock, oppositely disposed cutters pivoted at their upper ends to the stock, each being formed with a longitudinal slot, a longitudinally movable expander arranged between the cutters, a cross bar mounted in the expander and having its outer ends reduced and the shoulders formed at the inner ends of the reduced portions inclined and riders having their lower ends reduced and pivotally connected to the reduced ends of the cross bar, the upper ends of the riders being beveled and the lower ends of the riders being inwardly inclined and adapted in one position to engage the inclined shoulders formed at the inner ends of the reduced portions of the cross bar.

9. In a tool of the character speclfied, the

combination of a stock provided in opposite sides at its lower end with T-shaped open- 7 OHARLES L. MUNSINGER.

Witnesses:

JAMEs W. NEELY, RANsFERD HARRIS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents Washington, D. G. 

